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An important problem of many BNT-based perovskite piezoelectric materials for real applications is to increase and/or to disappear the depolarization temperature (T_d) as well as to achieve high piezoelectric properties. Many previous works, through various techniques, have tried to shift up the T_d and also enhance piezoelectric properties. In the present work, we report an alternative way to increase the T_d by using a boron oxide (B₂O₃) additive, where the boron ion in B₂O₃ is an interstitial dopant. The increase of T_d is proposed to relate with an internal stress formation in the ceramic, due to the doping effect. Furthermore, improvements of remanent polarization (P_r), piezoelectric properties, loss tangent value and energy harvesting performance of the ceramics are also enhanced for the doped samples.